Scorched Earth
Complete 'Burn 'em Out' on Veteran difficulty. (Solo only)
12/28/2012
5:04:36 AM
Ultra Rare 3.6%
Bearing the Burden
Complete 'Downfall' on Veteran difficulty. (Solo only)
12/4/2012
12:12:00 AM
Ultra Rare 2.3%
The Sun Sets
Complete 'Breaking Point' on Veteran difficulty. (Solo only)
11/1/2012
1:37:51 AM
Ultra Rare 2.6%
"When It Rains, It Pours"
Complete 'Eviction' on Veteran difficulty. (Solo only)
10/19/2012
4:31:23 AM
Ultra Rare 2.9%
Big Brawler
Get 10 consecutive zombie melee kills before Insta-Kill expires. (Map Pack 2 only)
10/12/2012
8:47:23 PM
Ultra Rare 3.5%